Inside the Church of the Immaculate Conception (Monumental Cemetery of the Capuchin Brothers)you’ll see one of the most horrific sights in all Christendom: there are a number of chapels filled with hundreds of skulls and crossbones woven into mosaics. To make this allegorical dance of death, the bones of more than 4,000 Capuchin friars were used. Many of the skeletons are still intact.